This is the travel guide to India recommended most by people that have made the trip.
There are several travel guides to India, what sets this one apart is the extensive reviews of hotels, restaurants, shops, and museums in just about every city.
While this book is targeted at the tourist instead of the business traveler, it does help you start to understand the people and culture of India. Besides, who is going to travel to an exotic place on the other side of the planet (for us Americans) and not check out a few unique and interesting attractions along the way?
The only caution is to be sure you get a new edition, as this book has been around for a while, be careful when buying used versions.
The Rough Guide to India (available on Amazon.com)